package com.todo.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
@Slf4j
public class RedisIdWorker {

    private static final long BEGIN_TIMESTAMP = 1672531200;


    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate=stringRedisTemplate;
    }

    /*
    序列号位数
     */
    private static final int COUNT_BITS = 32;

    public long nextId(String keyPrefix){
        // 生成时间戳
        LocalDateTime time = LocalDateTime.now();
        long nowSecond = time.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //生成序列号
        //生成序列号的key，获取当前日期精确到天
        String date = time.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //拼接并返回 或运算填充
        return timeStamp << COUNT_BITS | count;
    }

   /* public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2023,1,1,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second="+second);
    }*/
}
